Northern Airborne Technology N301A - Manual (Page 11)

N301A-000 Audio Controller
SM45 Installation and Operation Manual
Section 2 Rev: 1.00 Issue 4 Page 2-4
ENG-FORM: 805-0117.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
c) Run through all installed functions, and check the ICS and TX functions for all users. See section 3
for specific operation details.
Notes:
1) Significantly different headsets may have different mic characteristics
2) The David Clark M-7 mic is much more active than their M-4 or M-1 microphones, and may
aggravate headset imbalance if used in a mixed system.
d) If any preset requires adjustment, be sure this is carried out before the aircraft leaves, and that
the unit and its mating connector are secured before departure. Make all required log book
entries, electrical load, weight and balance amendments and other paperwork as required by your
local regulatory agency.
Upon satisfactory completion of all performance checks, make all required log book entries, electrical
load, weight and balance amendments and other documentation as required by your local regulatory
agency before releasing the aircraft for service.
2.4.7 Tie Line Mode Options
The tie line options can be selected using the right side adjustments - see section 2.5.2.
Note: The PVT ICS selection is not supported by the NAT tie line options - see section 3.3.4.4.
2.4.7.1 Andrea Tie line
The Andrea tie line option permits the use of up to ten individual boxes, but can support only one active
user at a time because of loading considerations. If all users are in ‘live’ mode there will be a significant
decrease in ICS audio level. See also section 3.6.3.
2.4.7.2 One NAT ICS Line
This option should be selected when two NAT audio controllers are tied together.
2.4.7.3 Two NAT ICS Lines
This option should be selected when three or more controllers are to be tied together. After three boxes
are connected together, the audio ICS level will degrade. NAT do not recommend that more than four
NAT boxes be tied together using the ICS tie line.
2.5 Adjustments and Connections
The unit is shipped from the factory with all internal adjustments set to the normal test levels. Once
installed in the aircraft, it may be desirable to change some of these settings to best suit the local
operating environment.
The internal adjustments that can be varied are located along the sides of the unit (refer to drawing
N301A\000\922-0) and are as follows: